The Bookmark is an online bookseller. When books are purchased, the shipping fees are added to the price. The table shows how sh
ipping fees are calculated. Purchase Total Less than $20 $20-$34.99 $35-$49.99 Greater than $50 Shipping Fees 3% of total 4% of total 6% of total 8% of total Sonja bought 3 books priced at $11.35, $9.50, and $14.70. Part A Determine the shipping fees for Sonja's order. Round the answer to the nearest hundredth if necessary. $ Part B What is Sonja's total cost including shipping? IOT Ha E
1 answer:
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Answer:
Confidence Interval is (21.76928571,23.43071429)
Step-by-step explanation:
The Formula we are going to use is:
±
Where:
μ is the mean of sample
σ is the standard deviation of population
n is the sample size
z is the distribution
In our case:
μ=$22.60,σ=$2.50
For 98% Confidence level, 1-α=98%
α=2%
α/2=1%=0.01
From Cumulative standardized Normal Distribution table
=2.326
P=23.430714 P=21.769286
Confidence Interval is (21.76928571,23.43071429)